JPH0335529Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a roll of an apparatus for sawing plate-shaped materials such as plywood, fiberboard, and gypsum board to a fixed size.

``Prior Art'' A plurality of rolls of a plate-like material sawing device, especially for plywood, are arranged one after the other on the circular saw 2 of the sawing device 1, consisting of a pair of upper and lower rolls shown in FIG. It was set up. These conventional rolls 3A and 3B have a cylindrical shape as shown in FIG. 5, and the upper roll 3A has a fluid cylinder (not shown) or an elastic material such as a spring (not shown) on the lower roll 3B. The rolls were mounted so that the load of the rolls was applied to the plywood material 4a to be cut through the rolls, and were driven at the same rotation speed.

"Problem that the invention attempts to solve" At this time, assuming that there is no flexure in the upper and lower rolls 3A and 3B in the axial direction, and that the plywood material 4a itself has a uniform thickness, the plywood material 4a The load on rolls 3A and 3B is applied linearly, and this is equal at every part that touches rolls 3A and 3B, and the linear pressure per unit acting on each part is calculated by dividing the roll load by the line length. The value is Kg/cm.

However, roll 3 placed above and below
Both ends of A and 3B are supported by bearings, and since a constant pressure is applied from both shafts of the upper roll 3A, the lower roll 3B is a roll in the axial direction. For the upper roll 3A, the self-weight deflection of the roll and the presser load on the lower roll 3B occur respectively, so the degree of deflection of both is lower than that of the lower roll 3.
B tends to be slightly larger than the upper roll 3A, and under normal conditions, the upper and lower rolls 3A, 3
The facing surfaces of B are not in uniform contact with each other in the axial direction, and an insufficient load occurs at the central portion in the axial direction.

Under such conditions, the upper and lower rolls 3A and 3B of the plate sawing device transport the plywood material 4a to the circular saw 2, and when the circular saw 2 cuts both ends of the plywood material 4a, the saw While resisting cutting resistance, it must be suppressed by linear pressure and maintain straight conveying force. Therefore, it is preferable to apply linear pressure evenly on the line perpendicular to the conveyance direction of the plywood material 4a;
Because the load is insufficient near the center of the upper and lower rolls 3A and 3B, the rolls are transported and cut without applying the expected linear pressure per unit near the center perpendicular to the transport direction. Resistance will have to be met. If the thickness of the plywood material 4a were uniform, the roll load would be reduced somewhat, but since the linear pressure is applied evenly to areas other than the vicinity of the central portion, almost the desired straight conveying force is guaranteed.

However, there are few cases where the thickness of the plywood material 4a is uniform, and usually there is some thickness unevenness in some part, and the upper and lower rolls 3
When the plywood material 4b having uneven thickness passes between A and 3B, the area in which each part on the line perpendicular to the conveying direction and the upper roll 3A is in contact with each other is reduced. Therefore, the linear pressure required to transport the plywood material 4b and to resist the sawing resistance is subtracted from the intended roll load by the area that does not come into contact with it, and the suppressing pressure during sawing transport is insufficient. Due to sagging and unspecified contact points with the rolls 3A, stability was lost during straight conveyance.

In addition, the cutting resistance of the plywood materials 4a and 4b is increased due to wear of the cutting edge of the circular saw 2 due to continuous sawing, and the wear of the left and right cutting edges becomes uneven, so that the upper and lower rolls 3A , 3B's drive is likely to slip, resulting in problems with straightness as described above, defective sized products after sawing, and a decrease in product value. .

Furthermore, as disclosed in Japanese Utility Model Publication No. 53-44160, not only the four circumferential parts of the plywood materials 4a and 4b are cut, but also a circular saw 2 is installed in the central part of the plywood materials 4a and 4b. , 4b, a method is adopted in which two sheets of plywood are cut at the same time. However, according to this method, the cutting resistance of the circular saw 2 added at the center position is added, so the cutting speed is lower than that described above. hand,
The holding pressure during cutting conveyance became even more insufficient, and straight conveyance became even more difficult.

``Means for solving the problem'' In view of the above, the present invention is based on the idea that the line pressure of the roll load on the plywood material is not constant on the line as in the past, but is applied at any position on the line. At least one of the upper and lower rolls located at the front and back of the sawing device that cuts the plate-like material has the outer edge of both ends. A recess is formed in which the outer diameter near the center is slightly smaller than the diameter, and a plate holding part having the same outer diameter as the outer diameter of the both sides is provided in the center of this recess to resist sawing resistance. In particular, it is compatible with the pressure required to simultaneously saw two plates with a circular saw installed in the center.

``Example'' Next, an example in which the roll 10 according to the present invention is attached to a sawing device 1 for plywood will be described with reference to FIGS. 1 and 2.

The roll 10 is disposed on lower rolls 3B provided before and after the circular saw 2 via a fluid cylinder (not shown) or an elastic material such as a spring (not shown).

The load of the roll 10 is made larger at both ends 11 in the axial direction of the roll 10 toward the center in order to concentrate the linear pressure on the plywood material 4b and resist sawing resistance. That is, compared to the outer diameter of both ends 11 of the roll 10, a recess 14 whose diameter is slightly smaller is formed at the outer diameter closer to the center.
In addition, a plate holding part 13 having the same outer diameter as both ends 11 is formed in the center of the recess 14 formed near the center, so that the linear pressure on which the roll load is concentrated is applied to both ends and the center. By separating, a restraining pressure is generated that resists the sawing resistance when the circular saw 2 is disposed at the central position.

In this example, the roll 10 used in the experiment by the applicant has a depth of the depression 14 of 0.5.
mm, but this depth is arbitrary depending on the thickness unevenness of the plywood material 4b being held and conveyed.

Next, the effect will be explained.

The upper roll 10 applies a load to the lower roll 3B by its own weight and an elastic material such as a spring (not shown) or a fluid cylinder (not shown), and under this state, the upper and lower rolls 1
As shown in FIG. 1, the plywood material 4b inserted between 0 and 3B is conveyed to the circular saw 2 with its surface receiving linear pressure from both sides 11 of the upper roll 10 and the central plate holding part 13. be done. That is, the line pressure of the roll load is applied to the plywood material 4b intensively on both sides and the central portion on a line perpendicular to the conveyance direction. In addition, rolls 10 and 3 arranged above and below
As for B, as described above, there is a tendency for the load to be insufficient near the central portion, so the linear pressure applied by the central plate holding part 13 may not be applied, and the plywood material 4b is transported by the linear pressure applied to both sides. Sometimes it is done.

Next, as shown in FIG. 2, the plywood material 4b is sawed by the circular saw 2, but during sawing, the plywood material 4b is subjected to sawing resistance, resulting in floating, sawing bending, etc. Stress is likely to occur.

However, since both side parts 11 formed at a certain distance from the central plate holding part 13 are applied as concentrated linear pressure on both sides of the plywood material 4b on a line perpendicular to the conveying direction, during sawing. Equal holding pressure acts on the left and right sides, ensuring straight conveyance, avoiding drum-shaped sawing as shown by the solid line in Figure 3, and making straight sawing possible as shown by the two-dot chain line. Become.

In addition, a circular saw 2 was additionally installed in the center, and 1
When sawing two sheets of plywood material 4b at the same time, the lifting of the plywood material 4b during sawing at the center is caused by line pressure being applied by the central board holding part 13, and this central board holding part 13 and both side parts 11 located on both the left and right sides
This allows for straight conveyance and straight saw cutting.

In addition, in this embodiment, for convenience, the plywood material 4b
The explanation is about the case where the cutting material is conveyed with the surface with uneven thickness facing upward, but the present invention is not limited to this. Similarly to the above description, straight conveyance and straight sawing can also be expected.

Further, in this embodiment, as shown in FIG. 1, the roll 10 is arranged on the upper side, but the roll 10 is not limited to this, and may be arranged on the lower side or both the upper and lower sides.

"Effects of the Invention" As described above, according to the device of the present invention, a pair of upper and lower rolls for conveying the plate-like object to the circular saw and then taking it out are disposed before and after the circular saw that cuts the plate-like object. In a plate sawing device, at least one of the rolls has a recess formed in which the outer diameter near the center is slightly smaller than the outer diameter of both ends, and the recess is formed in the center of the recess with a diameter that is the same as that of both ends. A plate holding part of the outer diameter is provided,
By concentrating the load on the plate at an arbitrary position on a line perpendicular to the conveyance direction and increasing the linear pressure per unit, the plate can be conveyed straightly and This means that you can expect a straight saw.

In addition, a plate holding part with the same outer diameter as both sides of the roll is provided at the center of the recess of the roll, so when sawing two plates at the same time, the lifting during sawing at the center will be reduced. , linear pressure applied by the plate holding part and linear pressure on both sides allows for straight conveyance and straight sawing.
This can prevent product defects and decreases in product value.

[Brief explanation of drawings]

Fig. 1 is a front view for explaining one embodiment of the roll according to the present invention in a sawing device for plywood;
Figure 3 is a plan view of the same, Figure 3 is an explanatory diagram illustrating problems that occur when sawing a thin plate-like object, Figure 4 is a schematic side view of a conventional sawing device for plywood using rolls, and Figure 5 is FIG. 3 is a front view of a conventional roll. DESCRIPTION OF SYMBOLS 1... Saw cutting device, 2... Circular saw, 10... Roll, 11... Both sides of roll, 13... Plate holding part, 14... Indentation.

Claims (1)

[Scope of utility model registration request] In a plate sawing device, a pair of upper and lower rolls are disposed before and after a circular saw for sawing the plate for transporting the plate to the circular saw and then taking out the plate, in which at least one of the rolls is A plate characterized in that a recess is formed in which the outer diameter near the center is slightly smaller than the outer diameter of both ends, and a plate holding part having the same outer diameter as the both ends is provided in the center of the recess. Roll of shaped body sawing device.